# US 11,078,586 B2 · Zinc-nickel composite plating bath, zinc-nickel composite plating film, mold and plating method

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- Number: US 11,078,586 B2
- Document ID: US11078586B2
- Status: Granted
- Kind: B2
- Application number: 16/333,267
- Filed: 2017-09-13
- Published: 2019-08-15
- Granted: 2021-08-03
- Earliest claimed: 2016-09-16
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Yuki Furukawa; Yoshimitsu Ogawa; Masahiro Yamanaka
- Web page: https://patentgrep.com/patent/US11078586B2

## CPC

- C25D 3/565: {containing more than 50% by weight of zinc}
- B22C 9/06: Permanent moulds for shaped castings (moulds for ingots B22D7/06)
- B22D 17/22: Dies (manufacture, see the appropriate class, e.g. B23P15/24); Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- C25D 5/36: of iron or steel
- C25D 7/04: Tubes; Rings; Hollow bodies
- C25D 15/00: Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

This zinc-nickel composite plating bath contains a zinc source, a nickel source, silicon dioxide particles and an ammonium-based dispersant in such ranges that enable the achievement of a zinc-nickel composite plating film wherein the codeposition amount of nickel is 10-16 wt % and the codeposition amount of the silicon dioxide particles is 7 vol % or more. Meanwhile, the pH of this zinc-nickel composite plating bath is 5.6 to 6.8.

## Claims

### Claim 1

A zinc-nickel composite plating bath comprising a zinc source, a nickel source, a silicon dioxide particle, and an ammonium-based dispersant for forming a zinc-nickel composite plating coating having a co-deposited nickel content of 10 to 16 Wt % and a co-deposited silicon dioxide particle content of 7 Vol % or more, wherein the zinc-nickel composite plating bath has a pH of 5.6 to 6.8, wherein the silicon dioxide particle has a scale-like shape or a dendritic shape.

### Claim 2 (depends on 1)

The zinc-nickel composite plating bath of claim 1, wherein the zinc-nickel composite plating bath has a pH of 6.1 to 6.8.

### Claim 3 (depends on 1)

The zinc-nickel composite plating bath of claim 1, wherein the zin-nickel composite plating bath comprises 50 g/L of zinc chloride as the zinc source, 30 g/L of a nickel chloride as the nickel source, 200 g/L of the silicon dioxide particles and 200 g/L of the ammonium-based dispersant.

### Claim 4

A plating method for forming a zinc-nickel composite plating coating on a surface of a steel material to be plated,
the plating method comprising:
a degreasing step of removing an oil component from the surface to be plated;
an etching treatment step of removing an oxide layer from the surface to be plated after oil component removal;
a desmutting step of removing a water-insoluble metal component from the surface to be plated after oxide layer removal; and
a plating step of subjecting the surface to be plated to an electroplating treatment using a zinc-nickel composite plating bath after metal component removal to form the zinc-nickel composite plating coating,
wherein the zinc-nickel composite plating bath contains a zinc source, a nickel source, a silicon dioxide particle, and an ammonium-based dispersant, the zinc-nickel composite plating bath has a pH of 5.6 to 6.8, wherein the silicon dioxide particle has a scale-like shape or a dendritic shape, and the zinc-nickel composite plating coating has a co-deposited nickel content of 10 to 16 Wt % and a co-deposited silicon dioxide particle content of 7 Vol % or more.

### Claim 5 (depends on 4)

The plating method according to claim 4, wherein the steel material is a mold, and the surface to be plated is an inner surface of a coolant passage formed in the mold.

### Claim 6 (depends on 4)

The plating method of claim 4, wherein the zinc-nickel composite plating bath has a pH of 6.1 to 6.8.

### Claim 7 (depends on 4)

The plating method of claim 4, wherein the zin-nickel composite plating bath comprises 50 g/L of zinc chloride as the zinc source, 30 g/L of a nickel chloride as the nickel source, 200 g/L of the silicon dioxide particles and 200 g/L of the ammonium-based dispersant.